*{
    margin: 0;
    padding: 0;
    /*标准盒子*/
    /*box-sizing: border-box;*/
}
li{
    list-style: none;
}
a {
    text-decoration: none;
}
.header {
    background-color: black;
    width: 100%;
    height: 50px;
}

.header .menu {
    display: flex;
    height: 100%;
    line-height: 50px;
    max-width: 600px;
    padding: 0 20px;
}
.header .menu li{
    height: 100%;
    color: white;
}
.header li:hover {
    background-color: #007bff;
    transition: color 0.5s;
}
.header .menu li a {
    font: bolder normal 16px Source Sans Pro;
    color: #fff;
    padding: 14px 15px;
}
.header .menu li p{
    font: bolder normal 16px Source Sans Pro;
    color: #fff;
    padding: 14px 15px;
}
.header .menu .用户设置的下拉菜单{
    display: none;
    position: absolute;
    background: black;
    /*border-radius: 5px;*/
}
.header .menu .用户设置的下拉菜单 li{
    padding: 0 0.5em;
    text-align: center;
}
.header .menu .用户设置:hover .用户设置的下拉菜单{
    display: block;
}

.标题{
    text-align: center;
    font-weight: normal;
    background-color: white;
    color: black;
    font-size: 40px;
    border-radius: 20px;
    border: blueviolet solid 2px;
    margin: 100px;
    margin-top: 40px;
    margin-bottom: 0;
    box-shadow: 10px 10px 20px rgba(0, 0, 0, .5);
}
.body {
    margin-top: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}
.shell{
    width: 90%;
    height: 700px;
    display: flex;
}
.box{
    flex: 1;
    overflow: hidden;
    transition: .5s;
    box-shadow: 10px 10px 20px rgba(0, 0, 0, .5);
    border-radius: 20px;
    border: 10px solid #fff;
    background-color: #fff;
    margin: 20px;
}
.box img{
    width: 200%;
    height: 70%;
    object-fit: cover;
    transition: .5s;
}

.box h2{
    text-align: center;
    font-size: 30px;
}
.box p{
    font-size: 24px;
    font-family: 华文宋体 serif;
    font-weight: normal;
    text-align: center;
}
.box a{
    color: #007bff;
    text-decoration: none;
    text-align: center;
    transition: all 0.01s;
}
.box:hover{
    flex-basis: 50%;
}
.box:hover>img{
    width: 100%;
    height: 80%;
}
.box .content:hover{
    flex-basis: 10%;
}
.box a:hover{
    color: #a29bf6;
}
